D-Link Nuclias Connect up to 1.3.1.4 Forgot Password data.exist response discrepancy

Summaryinfo

A vulnerability described as problematic has been identified in D-Link Nuclias Connect up to 1.3.1.4. This affects an unknown part of the component Forgot Password Handler. Executing a manipulation of the argument data.exist can lead to response discrepancy. This vulnerability appears as CVE-2025-34255. The attack may be performed from remote. There is no available exploit.

Detailsinfo

A vulnerability was found in D-Link Nuclias Connect up to 1.3.1.4. It has been declared as problematic. This vulnerability affects an unknown code block of the component Forgot Password Handler. The manipulation of the argument data.exist with an unknown input leads to a response discrepancy vulnerability. The CWE definition for the vulnerability is CWE-204. The product provides different responses to incoming requests in a way that reveals internal state information to an unauthorized actor outside of the intended control sphere. As an impact it is known to affect confidentiality. CVE summarizes:

D-Link Nuclias Connect firmware versions <= 1.3.1.4 contain an observable response discrepancy vulnerability. The application's 'Forgot Password' endpoint returns distinct JSON responses depending on whether the supplied email address is associated with an existing account. Because the responses differ in the `data.exist` boolean value, an unauthenticated remote attacker can enumerate valid email addresses/accounts on the server. NOTE: D-Link states that a fix is under development.

The weakness was presented by Alex Williams. The advisory is available at vulncheck.com. This vulnerability was named CVE-2025-34255 since 04/15/2025. The exploitation appears to be difficult. The attack can be initiated remotely. No form of authentication is required for a successful exploitation. Technical details are known, but there is no available exploit. The structure of the vulnerability defines a possible price range of USD $5k-$25k at the moment (estimation calculated on 10/31/2025). This vulnerability is assigned to T1592 by the MITRE ATT&CK project.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

The vulnerability is also documented in the vulnerability database at EUVD (EUVD-2025-34832). If you want to get best quality of vulnerability data, you may have to visit VulDB.

Productinfo

Vendor

• D-Link

Name

• Nuclias Connect

Version

• 1.3.1.0
• 1.3.1.1
• 1.3.1.2
• 1.3.1.3
• 1.3.1.4

License

• commercial

Website

• Vendor: https://www.dlink.com/

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If you want to get best quality of vulnerability data, you may have to visit VulDB.

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